Monday's Quiz Question

Answer: At the centre a tennis net has to be three feet high or 91.4 centimetres and at the posts it has to be three feet six inches high, and that's 106.7 centimetres.

If the net is slightly high or slightly low, it can dramatically affect your shots. For instance, if a tennis net is set just one inch (2.5 cm) too high it will have the same effect on your serve as shortening the service box by seven inches. This makes it much more difficult to get your serve in. And of course, a net that's too low creates other problems, like unfairly getting aced!